Lizet Elaine (simplyn2deep) wrote in 1_million_words,
Lizet Elaine

Word of the Day 11/19/18 Penumbra

Penumbra (noun)
penumbra [pi-nuhm-bruh]

noun, plural pe·num·brae [pi-nuhm-bree] /pɪˈnʌm bri/, pe·num·bras.
1. Astronomy.
a. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Compare umbra(def 3a).
b. the grayish marginal portion of a sunspot. Compare umbra(def 3b).
2. a shadowy, indefinite, or marginal area.

Related forms
pe·num·bral , pe·num·brous , adjective

Related Words for penumbra
shadow, dark, gloom, obscurity, shade, darkness, dusk, screen, cover, shadiness, umbrage, blackness, coolness, penumbra, umbra, semidarkness, gloominess, adumbration, shelter, protection

See more synonyms on

Origin: 1660–70; < New Latin, equivalent to Latin paen- pen- + umbra shade

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